solidification.C

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    Copyright (C) 2013-2017 OpenFOAM Foundation
    Copyright (C) 2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "solidification.H"
#include "addToRunTimeSelectionTable.H"
#include "thermoSingleLayer.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace regionModels
{
namespace surfaceFilmModels
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(solidification, 0);
 
addToRunTimeSelectionTable
(
    phaseChangeModel,
    solidification,
    dictionary
);
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
solidification::solidification
(
    surfaceFilmRegionModel& film,
    const dictionary& dict
)
:
    phaseChangeModel(typeName, film, dict),
    T0_(coeffDict_.get<scalar>("T0")),
    maxSolidificationFrac_
    (
        coeffDict_.getOrDefault<scalar>("maxSolidificationFrac", 0.2)
    ),
    maxSolidificationRate_
    (
        "maxSolidificationRate",
        dimless/dimTime,
        GREAT,
        coeffDict_
    ),
    mass_
    (
        IOobject
        (
            typeName + ":mass",
            film.regionMesh().time().timeName(),
            film.regionMesh(),
            IOobject::READ_IF_PRESENT,
            IOobject::AUTO_WRITE
        ),
        film.regionMesh(),
        dimensionedScalar(dimMass, Zero),
        zeroGradientFvPatchScalarField::typeName
    ),
    thickness_
    (
        IOobject
        (
            typeName + ":thickness",
            film.regionMesh().time().timeName(),
            film.regionMesh(),
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        film.regionMesh(),
        dimensionedScalar(dimLength, Zero),
        zeroGradientFvPatchScalarField::typeName
    )
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
solidification::~solidification()
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
void solidification::correctModel
(
    const scalar dt,
    scalarField& availableMass,
    scalarField& dMass,
    scalarField& dEnergy
)
{
    const thermoSingleLayer& film = filmType<thermoSingleLayer>();
 
    const scalarField& T = film.T();
    const scalarField& alpha = film.alpha();
 
    const scalar rateLimiter = min
    (
        maxSolidificationFrac_,
        (
            maxSolidificationRate_
           *filmModel_.regionMesh().time().deltaTValue()
        ).value()
    );
 
    forAll(alpha, celli)
    {
        if (alpha[celli] > 0.5)
        {
            if (T[celli] < T0_)
            {
                const scalar dm = rateLimiter*availableMass[celli];
 
                mass_[celli] += dm;
                dMass[celli] += dm;
 
                // Heat is assumed to be removed by heat-transfer to the wall
                // so the energy remains unchanged by the phase-change.
            }
        }
    }
 
    thickness_ = mass_/film.magSf()/film.rho();
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace surfaceFilmModels
} // End namespace regionModels
} // End namespace Foam
 
// ************************************************************************* //